The assessment centre, exercise by exercise

The five exercises that make up most assessment centres, how each is scored independently, and why a bad hour does not sink the whole day.

The short answer: An assessment centre is four or five separate exercises run in one day, each scored independently against the same competency framework by an assessor who usually has not seen your other scores. That structure has two consequences worth internalising. First, a weak exercise does not sink the day — the scores are combined at the end and one low mark among five is survivable, but carrying the disappointment into the next room converts one bad score into three. Second, because every exercise is scored against the same framework, preparing the framework once covers the entire day rather than each exercise separately.

Key points

Exercises are scored independently, usually by different assessors who have not compared notes — each room starts clean.
One weak exercise is recoverable; carrying it into the next exercise is what actually loses the day.
The same competency framework runs every exercise, so preparation is shared rather than per-exercise.
Assessors record behaviour rather than impressions, which means being visible and specific matters more than being liked.

The five exercises, and what each one measures

A typical assessment centre
Exercise	Duration	Primarily measures
Group exercise	30–45 min	Collaboration, influence, judgement in a group
Case or written analysis	45–60 min	Structure, analysis, written communication
Presentation	10–15 min plus questions	Clarity, handling challenge, commercial sense
Competency interview	45–60 min	Behavioural evidence against the framework
Role play or in-tray	30–45 min	Prioritisation, judgement under time pressure

The mix varies by employer. Almost all include a group exercise and a competency interview.

The exercises look unrelated and are not. Each is a different way of generating evidence against the same list of behaviours, which is why an employer runs several rather than one long interview: some people evidence collaboration well in conversation and badly in a group, and the centre exists to catch that.

Why independence is the most useful thing to know

Assessors are typically assigned to exercises rather than to candidates, and they score what happens in front of them. The scores are collated in a wash-up meeting at the end of the day. Until that meeting, nobody has a composite view of you.

The practical implication is that each room genuinely starts clean. If the group exercise went badly, the interviewer forty minutes later has no idea. Behaving as though they do — leading with an apology, being visibly deflated, or over-asserting to compensate — hands them a second weak observation drawn entirely from your own reaction to the first.

Preparing the framework rather than the exercises

Because one framework runs the whole day, the efficient preparation is to work out which competencies the employer uses and prepare evidence and behaviour for each — not to prepare five exercises separately.

Identify the competencies. They are usually on the careers site and repeated in the job description. Four to six is typical. Competency frameworks covers how to read them out of a posting.
Map your evidence. One strong story per competency, from your evidence bank, for the interview.
Decide the behaviour. For each competency, what does demonstrating it look like in a group exercise? If "commercial awareness" is on the list, it means bringing cost and customer into the group discussion, out loud, at least once.
Prepare the same content in three formats. Spoken in an interview, written in an analysis exercise, presented in a presentation. Same material, three deliveries.

This is also why the day is more predictable than it appears. The exercises differ, the standard does not, and the standard is usually published by the employer who is about to apply it to you.

A few logistics are worth handling in advance because they consume attention that the exercises need. Know how you are getting there and arrive with time in hand; a candidate who has been running is not at their best in the first exercise, which is frequently the group one. Eat properly beforehand, because the day is long and the interview is often after lunch. And bring a pen and paper even where materials are provided — in the case exercise you will want to plan before writing, and that is not the moment to be looking for something to write with.

If any part of the day would be materially harder for you for a reason the employer can accommodate — a disability, a health condition, anything affecting reading speed or fatigue — tell the recruiter when the invitation arrives rather than on the day. Adjustments are routine, they are made without comment, and they are not visible to the assessors scoring you. Arriving without asking, and performing below your level as a result, is the outcome nobody involved wanted.

Frequently asked questions

What happens if one exercise goes badly?

Considerably less than it feels like at the time. Scores are combined at the end and a single weak mark among five rarely decides the outcome. What does decide it is the candidate who spends the following exercise subdued, apologetic or over-compensating — the assessor in that room does not know the previous one happened and simply records what they see, which is now a second weak performance.

Are candidates competing against each other?

Usually against the standard rather than against each other, particularly on graduate programmes with a target intake. Everyone in the room can pass and everyone can fail. This matters most in the group exercise, where treating it as a contest produces exactly the behaviour that scores badly — see [group exercises](/learn/assessment-centres/group-exercises).

How should I behave during the informal parts?

Normally, and on the assumption that everything is visible. Lunches and coffee breaks are rarely formally scored, but assessors and current employees are present and impressions travel. The realistic advice is not to perform — it is to remember that the day has not ended, and to talk to people as you would on your first week rather than as a candidate.